Expose and allow manipulation of the raw URLs for graph widgets.

[adamsteffes]

Allows users to manipulate graphs quickly and with less clicking.

[discogestalt]

I'm working on how to do this properly within the framework I've set up for the app. There is an undocumented (bad, bad me for the lack of docs) feature that allows you to add tags on the URL for a dashboard which will apply those tags to all the graphs, e.g. for:

http://statuswolf.example.com/dashboard/5fd2dcb189aa0313b31d057045ebf6ad

You can do:

http://statuswolf.example.com/dashboard/5fd2dcb189aa0313b31d057045ebf6ad?host=foo|bar&datacenter=secret_evil_moon_base